Danny DeVito and Rhea Perlman Are Back Together

After a surprise separation last fall, Danny DeVito and Rhea Perlman are back together, PEOPLE has learned.

The beloved pair, married for 30 years and one of Hollywood's most enduring couples, have been quietly working on their relationship in recent months and have called off the separation, a source tells PEOPLE.

"They love each other," says a friend of the couple. "Always have and always will."

The It's Always Sunny in Philadelphia star, 68, and the former Cheers actress, 64, tied the knot in 1982 and have a son and two daughters, all in their 20s.